基于级数反演的双基前视高机动平台SAR成像算法

doi:10.16180/j.cnki.issn1007-7820.2019.09.014

Abstract

Abstract:

BFHM-SAR is a new and special imaging mode, which performs 2D imaging during the whole terminal diving period of high speed maneuvering platform. In the BFHM-SAR, the transceiver platform moves along different curve trajectories and has great velocities and accelerations, which leads to the problem of high-order terms under the double root and more serious range cell migration in the double-base distance history. In addition, this configuration has a more serious distance migration problem than monostatic or bistatic SAR. This study firstly corrected the range walk in time domain to reduce the two dimensional coupling, and then derived the two-dimensional frequency spectrum by the method of series reversion based on the accurate approximation of slant range in high order. The remaining rang cell curvature was corrected in range frequency azimuth Doppler domain and the high resolution imaging was completed after the pulse compression in both range and azimuth directions. In addition, focus depth in azimuth direction in this special configuration was analyzed in detail. Finally, the validity and feasibility of the proposed approach were verified with the simulation results.

Key words: synthetic aperture radar, bistatic forward-looking, high speed maneuvering platform, range cell migration, focus depth, series reversion

CLC Number:

TN957

ZHANG Aili,MENG Ziqiang. Imaging Method for Bistatic Forward-Looking High-speed Maneuvering-platform SAR Based on Series Reversion[J].Electronic Science and Technology, 2019, 32(9): 65-71.

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References 16

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参数	数值	参数	数值	参数	数值
λ/m	0.02	PRF/kHz	6	v_t'₀/m·s^-1	(0,1 800,-200)
B/MHz	100	ψ/(°)	20	a_t'/m·s^-2	(0,-35,15)
F_s/MHz	150	H_T/km	16	v_r₀/m·s^-1	(0,1 500,-150)
T_p/μs	2	H_R/km	15	a_r/m·s^-2	(0,-25,10)

参数	方位向			距离向
参数	PSLR/dB	ISLR/dB	分辨率/m	PSLR/dB	ISLR/dB	分辨率/m
目标点A	-13.00	-9.88	0.83	-13.28	-10.15	2.75
中心点P_c	-13.26	-10.14	0.82	-13.25	-10.14	2.75
目标点B	-13. 40	-9.92	0.85	-13.24	-10.12	2.75

Imaging Method for Bistatic Forward-Looking High-speed Maneuvering-platform SAR Based on Series Reversion

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